Ignition device



' J. S. COYLE.

IGNITION DEVICE- APPLICATION FILED JUNE 30, 1919.

Patented Apr. 13, 1920.

mmmm J [WE/V705 JSCOHE By I ATTORNEYS UNITED STATES PATENT OFFICE.

JAMES STEPHEN GOYLE, OF ST. LOUIS, MISSOURI.

IGNITIon DEVICE.

Specification of Letters Patent.

Patented Apr. 13, 1920.

Application filed June 30, 1919. Serial No. 307,667.

' To all whom it may concern Be it known that 1, JAMES S. Gone, acitizen of the United States, and a resident of St. Louis, in the Stateof Missouri, have invented a new and Improved Ignition Device, of whichthe following is a full, clear, and exact description.

The present invention relates to new and useful improvements in ignitiondevices for ton.

lVith the abox e and other objects in view reference is had to theaccompanying drawings in which- Figure 1 is a view in elevation of aspark plug constructed in accordance with the present invention;

Fig. 2 is an enlarged vertical sectional View thereof; 1

Fig. 3 is a bottom plan view.

Referring more particularly to the drawings, the reference character 5designates the spark plug shell, which is constructed of metal in theordinary manner, and said shell is screw-threaded as at 6 to provide forits attachment in the cylinder head of an explosion motor. Passingthrough the metallic shell 5 is the porcelain body 7 of the spark plug,and said porcelain body 7 is secured in place by means of the nut 8.Interposed between the shell 5 and the porcelain body 7, are gaskets ofcopper or other suitable soft metal, which prevent the passage of gasaround said porcelain body 7.

The porcelain body 7 is provided with a central passage 10, and thelower end of said passage 10 is enlarged as at 11, its upper end beingalso enlarged at 12. Mounted in the central passage 10 of the porcelain,

body 7, is one electrode 13, the other electrode 14 being secured to theshell 5. The electrode 13 is slidably mounted in the passage 10, andnear its lower end itis provided with a piston 15, which operates inthelower enlarged portion 11 of the passage 10, and this .piston isprovided with rings 16 for providing a tight joint between said pistonand the enlarged portion ll-of the passage 10.

Mounted in the enlarged portion 12 of the passage 10, and surroundingthe electrode '13, is a coil spring 17,. the upper end of which engagesawasher 18. Depending from the washer 18 and two guides 19 in the form ofrigid rods, which operate in recesses 20, in the porcelain body 7. Thewasher 18 is prevented from passing off the upper end of the electrode13 by the nut 21 and its locknut 22, both of which are threaded on theupper end of said electrode.

To prevent movement of the porcelain body 7 relativeto the shell 5, thelatter is provided with a projecting lug 23, which isv received in arecess 24 in the said porcelain body 7 as best shown in Fig. 3.

The lower end of the electrode 13 is bent -at right angles, as at 25,and is bifurcated to embrace the right-angular end 26 of the electrode14. As shown in Fig. 2, the electrode 13 is provided with a valve 27,which is adapted to close the passage 10 when the piston 15 is in theosition shown.

The operation of the device is as follows:

Upon theintake stroke of the piston, of the internal combustion motor,the piston 15 is moved toward the open end of the enlarged portion 11 ofthe passage 10, and the right-angular end 25 of the electrode 13 wipesthe right-angular end 26 of the electrode 14, removing all deposit offoreign matter therefrom. As the piston in the motor moves on itscompression stroke, the piston 15 is moved to the position shown in Fig.2, in which position there is suflicient gap to give the necessary sparkto ignite the charge compressed. As the operation of the motorcontinues, the above action takes place upon each reciprocation of thepiston, thus assuring clean electrodes at all time.

What is claimed is: I

In a spark plug for motors, a stationary electrode, a rod extendinglongitudinally of the body of, the spark plug and having a bifurcatedelectrode on one of its ends, and a piston carried by said rod, andmovable in a cylinder formed in the body of the electrode in thepresence of the stationary electrode to remove deposits of hydrocarbontherefrom.

JAMES STEPHEN COYLE,

